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Series RB rockfall barriers |
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The “RB” (from Italian ‘net with knots covered by boss’) rockfall barrier has been designed to contrast the issue of rockfall events generating, on impact, slight energy. At present the only product manufactured and certified is model AC 800 RB, which generally comprises the following: - SUPPORT STRUCTURE: consisting of 193.7/5.3mm diameter tubular steel support struts, 4.60 m high, laid at a nominal center distance of 8.00 m, surmounted by topmost fairlead tube, panel release mechanism and base housing for ball hinge unit;
- CAPTURE AND/OR CONTAINMENT STRUCTURE: consisting of net panels in AZn 7x7 rope, 5.00 m high and 8.00 m long, 8 mm diameter, forming a 250mm square mesh, nodes clamped by pressure locked bosses, AZn 7x19 perimeter rope, 16mm diameter, complete with eyes for the linking to bottom dampers; each panel is provided with two braking mechanisms each comprising two AZn 7x19 friction ropes, 18mm diameter, carrying, in series, two dampers consisting of two specially shaped plates and one heat-treated C70 carbon steel flat plate, blocked by four Class 8.8 M14 bolts torqued to 70 Nm and protected from rusting by black cataphoresis coating and placed in a plastic container; the panel is connected to a heavily coated galvanized 2.7mm diameter steel wire woven into a 80x100mm double-twisted net hexagon mesh;
- LINKING STRUCTURE: consisting of four 12 mm diameter galvanized steel ropes for upslope, downslope, diagonal and side (only for outer uprights) installation, connected to the top of each upright and linked to ground anchors;
- GROUND FOUNDATION, beneath the support structure, for each upright, a 73x5.4mm diameter tubular micropile with length related to the mechanical characteristics of the soil and surmounted by a swivel joint for the linking structure, comprising anchorage points in double spiroid rope with suitable cross-section and length.
The barrier is accompanied by a test certificate issued by accredited body following a crash-test carried out in the field in real-life conditions.
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